New study on ship impact on marine wildlife

Dawn Renton

Electronic navigation safety technology is to be used to study the potential impacts of marine traffic on whale, dolphin and porpoise species in a new season of research expeditions.

For the first time, scientists and trained volunteers onboard the Hebridean Whale and Dolphin Trust’s specialized research yacht Silurian will use an Automatic Identification System (AIS) transponder to collect detailed data on other vessels’ movements. This will be combined with sightings and underwater acoustic monitoring of cetaceans – the collective name for whales, dolphins and porpoises – to gain new insights into how species are affected by ships’ movements and noise.

AIS – an automatic tracking system that electronically identifies and locates nearby vessels, continuously transmitting details of their identity, position, speed and course – is more commonly used in navigation safety, allowing ships to ‘see’ each other in all conditions.

With marine traffic from a large range of industries growing, known threats or pressures for cetaceans from shipping include ship-strikes – in which vessels accidentally hit whales – and noise pollution from poorly designed or poorly maintained vessels, which can mask out whale sounds used for communication and navigation.

Dr Conor Ryan, Hebridean Whale and Dolphin Trust science officer, said: “This innovative approach provides us with an opportunity to enhance our long-term research, which is providing unprecedented insights into the distribution and range of cetaceans in Scotland’s seas, as well as the challenges they face – including the unintentional consequences of human activities.

“The Hebrides may seem like a wilderness, but human impacts on the marine environment are significant – and likely to increase with expansions in marine industries, such as aquaculture and renewable installations. Strengthening scientific understanding is crucial if we are to help industries ensure that their impacts on Scotland’s remarkable whales, dolphins and porpoise populations are minimal.”

The Trust – based in Tobermory on the Isle of Mull – is recruiting paying volunteers for its surveys. Between May and October, there will be 12 separate expeditions, each lasting between one and two weeks. This includes two ‘Teen Teams’ reserved for 16 to 17-year-olds.

These volunteers will work and sleep on Silurian, receiving specialist training and working with scientists – conducting visual surveys, acoustic monitoring, and cetacean identification through dorsal fin photography. They will also be able to develop sailing and navigation skills as they visit some of Britain’s most remote and wild corners.

As well as strengthening knowledge about cetaceans and contributing to recommendations to safeguard them, the trust’s surveys are important because cetaceans are apex predators at the top of the marine food web, and so can act as indicators of the marine environment’s overall health.

The 2016 surveys depart from Tobermory on the Isle of Mull, Kyle of Lochalsh or Ullapool. The new addition of Ullapool as a rendezvous point will allow the trust to carry out more surveys in the remoter corners of its study area. Areas covered depend on the weather but will range from Mull of Kintyre in the south, Cape Wrath in the north and St Kilda in the west.